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Cascaval D.,Technical University Gheorghe Asachi | Galaction A.-I.,University Of Medicine And Pharmacy Grt Popa Of Iasi
Chemical Engineering Communications | Year: 2012

Facilitated pertractions of cinnamic acid and p-methoxycinnamic with Amberlite LA-2 in pseudo-steady-state mode have been comparatively analyzed. The experiments have been carried out using a U-shaped pertraction cell that allowed easily maintaining the liquid membrane between the two aqueous phases. On the basis of the theoretical investigation, a model describing the solute accumulation inside the liquid membrane by means of the permeability factor has been developed. The proposed model offers good concordance with the experimental data and can be useful for facilitated pertraction optimization. © Taylor & Francis Group, LLC. Source


Georgescu I.-S.,Technical University Gheorghe Asachi | Genes C.,Technical University Gheorghe Asachi | Costache C.,Technical University Gheorghe Asachi | Baciu E.-R.,University Of Medicine And Pharmacy Grt Popa Of Iasi | And 2 more authors.
Key Engineering Materials | Year: 2015

In order to ensure adherence of the arc sprayed layer, on the metal substrate, a few specific operations must be performed: initial cleaning, degreasing, roughening, final cleaning and degreasing. At the moment, there are standards which refer to the degree of preparation for processing metal surfaces by spraying. Performing metallic surface preparation operations require compliance with specific health and safety measures and environment protection. © (2015) Trans Tech Publications, Switzerland. Source


Cascaval D.,Technical University Gheorghe Asachi | Galaction A.-I.,University Of Medicine And Pharmacy Grt Popa Of Iasi | Kloetzer L.,Technical University Gheorghe Asachi
Romanian Biotechnological Letters | Year: 2010

Using the statistical analysis and factorial experiments of second order, two mathematical correlations for the reactive extraction of PABA with Amberlite LA-2 dissolved in n-heptane have been established for systems without and with 1-octanol. These equations describe the dependences between the extraction yield and the main parameters influencing the separation efficiency (pH of aqueous phase, extractant concentration and extraction duration). For both cases, the considered variables control the separation process in a 94.6-99.2% extent, the sense and the magnitude of variables influences depending on the alcohol presence. © 2010 University of Bucharest. Source


Cascaval D.,Technical University Gheorghe Asachi | Galaction A.-I.,University Of Medicine And Pharmacy Grt Popa Of Iasi | Lupasteanu A.-M.,Technical University Gheorghe Asachi
Romanian Biotechnological Letters | Year: 2010

The comparative study on the mechanical disruption of S. cerevisiae immobilized cells in alginate (biocatalysts with 4, 4.6 and 5.2 mm diameters) for a bioreactor with stirred beds of biocatalysts and six radial impellers indicated the intensification of mechanical lysis with the increase of particles size and volumetric fraction. The mechanical lysis is produced mainly by the collision between the biocatalysts particles or between them and the impellers blades. The paddle with six blades and the pitched bladed turbine induced the less important effect on biocatalysts physical integrity, these impellers being recommended for the bioreactors with stirred beds of immobilized yeasts cells. © 2010 University of Bucharest. Source


Cascaval D.,Technical University Gheorghe Asachi | Galaction A.-I.,University Of Medicine And Pharmacy Grt Popa Of Iasi | Nicuta N.,Science Antibiotice
Chemical and Biochemical Engineering Quarterly | Year: 2010

The paper presents the results obtained by analyzing the free and facilitated pertraction of Erythromycin from S. erythreus broths with cells concentration between 5 and 20 g L-1 DM. using dichloromethane as liquid membrane and D2EHPA as carrier. The pertraction has been carried out in pseudosteady-state regime, using the U-shaped pertraction cell that allows obtaining and easily maintaining the free liquid membrane. The increase of the biomass concentration in the feed phase led to the significant reduction of the initial and final mass flows of antibiotic, the addition of carrier in the liquid membrane attenuating this effect. Compared with the pertraction from simulated broths having the same apparent viscosity, but without solid phase, the mass flows are reduced up to 5 times for free pertraction, respectively up to 3 times for facilitated pertraction. Only the membrane permeability was favorably influenced by the biomass presence and accumulation, but this effect did not lead to the real increase of process efficiency. Source

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